LARCH INSECTS. 903 
29. The larch chermes. 
Chernw laricifolice Fitch. 
Order Hemiptkba ; family Aphid^e. 
Solitary and stationary upon the leaves, extracting their juices, small black shin- 
ing flies 0.10 long, having the abdomen dark green, the legs obscure whitish, the 
wings nearly hyaline with pale brown veins, and the large stigma-spot upon their 
outer margin beyond the middle more opaque and pale green. 
This is closely like the pine Ghermes, but has the wings more clear, 
and differs also in some of the details of its colors. (Fitch.) 
Dr. Hagen notes its occurrence in the Arnold arboretum. (Can. Ent., 
1889, p. 126.) 
30. The red mite. 
Tetranychii8 telarius Linn. 
In June, the foliage of the larches in the grounds of the University 
at Normal were seriously affected by the red mite (Tetranychus telarius 
L.), some of the trees seeming likely to die. On one of those worst in- 
fested we tried the effect of spraying with a kerosene emulsion made 
with soap, and diluted to contain 2J per cent, of kerosene. The insects 
were greatly reduced in number by a single application, but not all 
killed. The tree soon revived appreciably as compared with those not 
treated. (Forbes's Third Rep. Ins. 111.) 
The following insects also occur on the larch: 
Order Lepidopteea. 
31. In July and August troops of white caterpillars with black dots 
and along their backs eight black tufts of hairs. The larvae of the 
hickory tussock moth (Lophocampa caryce), are sometimes found 
on this tree, nearly stripping the leaves from the limbs which 
they occupy. (Fitch.) 
32. In Labrador I have found the larva of what I suppose to be Arctia 
quenselii feeding upon the larch in July. As this insect also in- 
habits the summit of Mt. Washington, N. H., it should be looked 
for there on larches. 
33. Pieris menapia. Injures the tamarack on the Pacific coast. (Anier. 
Nat., Oct., 1882.) 
Order Coleoptera. 
34. Dendroctonus sp. In immense numbers under the bark of sickly 
and dying trees. Harrington, Can. Ent., xvi, p. 218. See also 
Proc. Ent. Soc, Wash., I, p. 175. 
35. Hylesinus opaculus. Associated with the preceding beetle. Har- 
rington, Can. Ent., xvi, p. 218. 
36. Tomicus pint. Harris's Treatise, etc., 88. 
